The ferocious backflip of Meghan Markle's brother.

In April last year, Meghan Markle’s now infamous half-sister Samantha Grant announced she was writing a book. It was to be called The Diary of Princess Pushy’s Sister, and the crux was to be exactly as it sold itself.

Almost immediately, Markle’s family were firm on the line of her defence. Samantha was out of line, they said. It wasn’t fair.

In an interview with Mail Online at the time, Grant’s brother and Markle’s half-brother, Thomas Markle Jr, disparaged the way his sister was attacking the limelight.

“She’s just doing it because she’s got nothing better to do and it’s what she’s always done. Her whole life has just been about being a pain in the a**.

“It’s why nobody talks to her and hasn’t for a long, long time. Leave Meghan alone already – it’s ridiculous,” he said.

Why the world is so obsessed with Meghan Markle in the lead-up to the royal wedding. (Post continues after audio.)

Fast forward a single year, and Thomas Markle’s name, face and most ferocious quotes are bandied across news outlets across the world.

Later that week, he sat down for an interview with Melissa Doyle for Channel 7’s Sunday Night. He told Doyle while the family may be “fractured”, they are, by definition, still family.

“She can’t forget about her family, because we’re never gonna go away [sic]. We’re always gonna be her family,” he said.

And then came his most extraordinary attack of all, penning a scathing open letter to Prince Harry about his sister and why it is a mistake for the two to marry.

“As more time passes to your royal wedding, it became very clear that this is the biggest mistake in royal wedding history,” he wrote, as per In Touch. “Meghan Markle is obviously not the right woman for you.”

Markle went on to call his sister a “jaded, shallow, conceited woman that will make a joke of you and the royal family heritage.”

And then, the clincher:

“Not to mention, to top it all off, she doesn’t invite her own family and instead invites complete strangers to the wedding. Who does that?” he said.

“You and the royal family should put an end to this fake fairytale wedding before it’s too late.”

Interesting, you could note, that Thomas Markle’s tune changed rather dramatically when it was reported the royal wedding invites had been dispatched. And one didn’t land in his letter box.